第三单元

Unit three

Sweet dreams甜甜的梦

Millimeters, decimeters, kilometers

毫米,分米,千米的认识

Lesson one

1. How long is a millimeter?

1毫米有多长呢？

2. The length of a small square on a ruler is 1 millimeter, and millimeters are expressed in mm.

尺子上1小格的长度是1毫米，毫米用mm表示。

3. A penny coin is about a millimeter thick.

1分硬币的厚度大约是1毫米。

4. The thickness of an ID card is about 1 millimeter.

身份证的厚度大约是1毫米。

5. Ten sheets of paper are about one millimeter thick.

10张纸的厚度大约是1毫米。

6. I discovered that 10 millimeters is 1 centimeter.

我发现10毫米就是1厘米。

7. One centimeter is equal to 10 millimeters

1厘米=10毫米

8. How long is a decimeter?

1分米有多长呢？

9. Ten centimeters is one decimeter, and decimeters are denoted by dm.

10厘米就是1分米，分米用dm表示。

10. One decimeter is equal to 10 centimeters

1分米=10厘米

11. My hand is about a decimeter long.

我的手长大约是1分米。

12. I measured the height of the chalk box about 1 decimeter.

我量了一下，粉笔盒的高度大约是1分米。

13. I find that there are 10 decimeters in a meter.

我发现1米里面有10个1分米。

14. One meter is equal to 10 decimeters

1米=10分米

15. The staff is 5 centimeters long, how many millimeters is it in millimeters?

金箍棒长5厘米，用毫米作单位是多少毫米？

16. One centimeter is 10 millimeters, and five centimeters is 50 millimeters.

1厘米是10毫米，5厘米就是50毫米。

17. 5 centimeters is equal to 50 millimeters

5厘米=50毫米

18. Golden hoop stick is long 70 cm, how many decimeter is unit with decimeter?

金箍棒长70厘米，用分米作单位是多少分米？

19. Let's practice together!

我们一起练习一下吧！

Lesson two

1. I can make the staff one kilometer long. How long is a kilometer?

我能把金箍棒变成1千米长。1千米有多长？

2. A kilometer is a thousand meters, and a kilometer is also called a kilometer.

1千米就是1000米，千米又叫公里。

3. One kilometer (kilometer) is equal to 1,000 meters

1千米（公里）=1000米

4. A kilometer is written by the letter Km, and a kilometer is written as 1Km.

千米用字母Km表示，1千米写成1Km。

5.1Km=1000m

6. How many meters are 2 kilometers?

2千米是多少米？

7. 2 kilometers is 2 1,000 meters, which is the same thing as 2000 meters.

2千米是2个1000米，也就是2000米。

8. Millimeter, centimeter, decimeter, meter, kilometer (kilometer) are all units of length.

毫米、厘米、分米、米、千米（公里）都是长度单位。

9. Let's practice together!

我们一起练习一下吧！

Lesson three

1. Think about it. There are many wonderful animals in the world. Do you want to know something about them?

想一想，世界上有很多奇妙的动物，你想了解有关它们的知识吗？

2. Check, you can go to the zoo, on the net or in the library.

查一查，可以到动物园、网上或图书馆里去了解。

3. Please share the information you have found with us。

说一说，请同学将自己查到的信息与大家分享.

4. Just a second, there are so many ways to access data.

The animal world is wonderful.

议一议，查阅资料的方式可真多。动物世界真奇妙。